Data processing system write protection mechanism

Details Data processing system write protection mechanism Data processing system write protection mechanism

1980-10-01

1984-02-14

Thomas, James D.

Boots, shoes, and leggings

G06F 922, G06F 1100

Patent

active

044320507

ABSTRACT:
Use of a control storage device coupled with a central processing unit is locked, during the loading process from the unit to the device, to a would-be user of the device until such loading process is complete as indicated by a so-called "unlock" command received from the central processing unit. An indication of an error or malfunction in the control storage device either during the loading process or thereafter is also provided to the central processing unit.

REFERENCES:
patent: 3588839 (1971-06-01), Belady
patent: 3760171 (1973-09-01), Wang
patent: 3889243 (1975-06-01), Drimak
patent: 3967247 (1976-06-01), Anderson et al.
patent: 4030073 (1977-06-01), Armstrong
patent: 4084234 (1978-04-01), Calle et al.
patent: 4101969 (1978-07-01), Lawson et al.
patent: 4145742 (1979-03-01), Olander, Jr.

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